(19)
(11) EP 0 934 813 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.04.2001 Bulletin 2001/15

(43) Date of publication A2:
11.08.1999 Bulletin 1999/32

(21) Application number: 99101938.1

(22) Date of filing: 29.01.1999
(51) International Patent Classification (IPC)7: B29C 61/00, C08J 5/18
// C08L67:02
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 30.01.1998 JP 1885098
30.03.1998 JP 10408698

(71) Applicant: Toyo Boseki Kabushiki Kaisha
Osaka 530-0004 (JP)

(72) Inventors:
  • Mori, Kuniharu
    Inuyama-shi, Aichi-ken (JP)
  • Inoue, Mitsuo
    Osaka-shi, Osaka (JP)
  • Okumura, Shinichiro
    Inuyama-shi, Aichi-ken (JP)
  • Oko, Tsutomu
    Inuyama-shi, Aichi-ken (JP)
  • Tabota, Norimi
    Inuyama-shi, Aichi-ken (JP)
  • Hashimoto, Masatoshi
    Inuyama-shi, Aichi-ken (JP)
  • Ito, Hideki
    Inuyama-shi, Aichi-ken (JP)
  • Takabayashi, Seizo
    Inuyama-shi, Aichi-ken (JP)
  • Isaka, Tsutomu
    Osaka-shi, Osaka (JP)

(74) Representative: Weber, Thomas, Dr.Dipl.-Chem. et al
Patentanwälte von Kreisler-Selting-Werner, Postfach 10 22 41
50462 Köln
50462 Köln (DE)

   


(54) Thermo-shrinkable polyester film


(57) In a thermo-shrinkable polyester film, the thermal shrinkage ratio in a main shrinking direction is about 20% or more after being treated in water of about 70°C for about 5 seconds, about 35 to about 55% after treated in water of about 75°C for about 5 seconds, and about 50 to about 60% after being treated in water of about 80°C for about 5 seconds. After the film is shrunk by about 5% by treatment in water of about 75°C for about 10 seconds, the probability of the elongation at rupture of the film in the direction perpendicular to the main shrinking direction being about 20% or less, is about 10% or less. The ratio of τ1/τ2 is about 0.05 to about 0.45, where τ2 is the stress of shrinkage in a main shrinking direction of the film at about 90°C, and τ1 is the stress of shrinkage in a direction perpendicular to the main shrinking direction of the film at about 90°C. The sealing strength of the film is about 1.2 kg/15 mm of width or more.






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